Means for imparting gyratory motion to sieve-boxes and other bodies.



No. 830,309. PATENTED SEPT. 4, 1906.

. B. R. BEAVER. MEANS FOR IMPARTING GYRATORY MOTION TO SIBVE BOXES AND OTHER BODIES.

APPLICATION FILED JUNE22,1906.

2 SHEETS-SHEET 1.

wzam wm N0- 880,309. PATENTED SEPT. 4, 1906.

B. R. DRAVBR. MEANS FOR IMPARTING GYRATORY MOTION TO sum: BOXES AND OTHER BODIES.

APPLICATION FILED I'm}: 22,1906.

2 SHEETSSHEET 2.

- make and use the same.

' gyratory sifter, the same,

' two-compartment type and is formed with a The numeral 1 indicates the floor, and the "niimeral 2 the overhead support or ceiling, of "a'structure in which the machine is installed. Thenumeral 3 indicates the sieve-box or UNITED STATES PATENT OFFICE.

EMIL R. DRAVER, OF RICHMOND, INDIANA.

MEANS FOR IMPARTING GYRATORY MOTION TO SlEVE-BOXES AND OTHER BODIES.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed June 22,1906. Serial No. 322,847.

skilled in the art to w 'ch it appertains'to My present invention has for its especial object to provide an improved mechanism for imparting gyratory motion to sieve-boxes of atory sifters, such as are commonly use for bolting or grading mill products.

The invention relates more particularly to the improvement of that type of motionroducing mechanism wherein a vertical riving-shaft is disposed centrally with respect to the sieve-box and is connected to the sievebox by eccentrics, the said shaft being provided with eccentric or unbalanced weights, with the'parts so arranged that the force of the weights will offset approximately the inertia of the sieve-box, whereby the box will be driven with a gyratory movement equal or approximately equal to the throw of the eccentrics, while the shaft itself will remain stationary or substantially stationary during the ordinary operation of the machine.

To the above ends the invention consists of the novel devices and combinations of devices hereinafter defined in the claims.

In the accompanyin drawings, which illustrate the invention, li e characters indicate like parts throu hout the several views.

Referring to the drawings, Figure 1 is a vertical section taken on the line w w of Fig. 2, showing my invention applied to a sieve-box or'gyratory sifter, some parts being broken away and some parts being shown in full; and Fig. 2 is a horizontal section taken through the machine on the line a: m of Fig. 1.

as shown, being suspended from the ceiling 2 by means of flexible rods 4. The sieve-box 3 is of the centrally-located open space 5, that runs from top to bottom thereof.

' reduced to form Rigidly secured tothe sieve-box in the open space concentric to the vertical axis of the sieve-box and located one at the top and one at the bottom of said sieve-box is a pair of eccentric-seats or bearing-sleeves 6. tubular shaft 7 extends vertically through the seats 6 and is provided with eccentrics S, that work one in each of the said eccentricseats 6. The said tubular shaft 7 is also provided with unbalanced weights 9, that extend laterally or eccentrically in a direction op posite to the offset of the eccentrics 8. These unbalanced weights 9 are located,-preferably,

as shown, one above and the other below the sieve-box.

The weight of the tubular shaft 7 is not sustained by the sieve-box, but, on the contrary, is taken by a flexible rod 10, which is passed loosely through said tubular shaft, is securely attached to the ceiling or overhead support 2 at its upper end, and at its lower end is provided with a ball-supporting cap 11 between which and the lower end of said tubular shaft 7 bearing-balls 12 are interposed. As shown,.the upper end of the suspendingrod 10 is attached to a ceiling-bracket 13by means of a pair of nuts 14.

To the lower end of the tubular shaft 7 a sleeve-like cup or cap 15 is secured, as shown, by means of a set-screw 16. This cap 15 serves as an oil-cup to hold oil, in which the bearing-balls 12 may run, and acts as an ex tension of the lower end of the tubular shaft 7 and cooperates with a relatively fixed annular thrust-limiting flange 17 to limit the extreme gyration of the said tubular shaft 7. As shown, the depending end of the cap 15 is a trunnion 18, that works within the annular flange 1.7, and the said flange 17 is shown as cast integral with a rigidly-secured floor-plate 19.

Rotary motion is imparted to the tubular shaft 7 by a belt 20, that runs over a pulley 21 of a power-shaft 22, over a pair of idle guide-pulleys 23, secured to brackets 24 on the sieve-box, and over an eccentric-pulley 25 on the lower portion of said tubular shaft 7. The driving-shaft 22 is mounted in fixed shaft 7 in the same direction as the offset of the eccentric 8, and it is offset with such amount of eccentricity that it will compensate for the lateral movement of the sievebox with respect to the shaft 7, which is imparted thereto by saideccentrics 8. Othernular flange 17 of the floor-plate 19 and the depending end 18 of the cap 15 cooperate to limit the extreme movement whiehmay possibly be imparted to .the shaft-7 when the machine is thus started into action. After motion has been imparted to the shaft 7 for a short time the sieve-box will acquire a regular gyratory motion which is approximately equal to the throw of the eccentrics 8, and the shaft 7 will settle down to approximately true rotary motion and will be given little or no giyratory motion.

e driving mechanism above described, while simple and of small cost, is highly efficient for the purposes had in view. v

The improved means above described for imparting gyratory motion may'of course be used generally wherever itis desired to-impart gyratory motion to a movable body which is so suspended or supported that it is ca able of such gyratory motion.

at I claim is 1. The combination with a body, of means for gyrating the same comprising a shaft having eccentric connections therewith and having a driving-pulley eccentrically mounted thereon, and a power-driven belt running over said eccentric-pulley, with said eccentric-pulley arranged to compensate for gyratory movements of said body with res ect to said shaft, whereby an approximate y constant belt tension is maintained, substantially as described.

respect to said shaft, whereby an approximately constant belt tension is maintained,

substantially as described.

3, The combination with a freely-suspended body, of means for imparting gyratory 5 motion thereto, comprising a vertically-disstantially as described.

4. The combination with afreely-suspended body, of a power-driven, vertically-disposed tubular shaft having eccentric connections to said body, and provided with an unbalanced weight, of a SuSpending-rod. suitably supported at its upper end, extended through said tubular shaft and. provided at its lower end with hearing devices engaging, the lower end of said shaft and su porting the same, and an oil-cup secured to t 10 lower end of said tubular shaft and inelosing the said bearing devices, substantially as described.

5. The combination with a freely-suspended body, of a power-driven, vertically-disposed tubular shaft having eccentric connections to said body, and provided with an unbalanced weight, of a suspending rod suitably supported at its upper end,'extended through said tubular shaft a'mg provided at its lower end withbcaring devices that engage the lower end of said tubular shaft and support the same, an annular thrust-limiting flange secured below said tubular shaft, and an oil-cu secured to the lower end. of said tubular s aft and inclosing said bearing devices, said-oil-cup having a depending portion that works within said annular thrustflange, substantially as described. i

6. The combination with a freely-suspended body, of a power-driven, vertically-disposed tubular shaft having eccentric connections to said body and provided with an unbalanced weight and havinga driving-pulley eccentrically mounted thereon, idle guidepulleys carried by said body, a driving-pulley supported independently of said body, a belt running oversaid drivingpulley, over said idle guide-pulleys, and over said-eccentric-pulley, and a suspending-rod suitably supported at its upper end, extended through said tubular shaft and provided at its lower end with bearing devices engaging the lower end of said tubular shaft and-supporting the same, substantially as described.

7. The combination with a freely-suspended body, of a power-driven, vertically-disposed tubular shaft having eccentric connections with said body, and provided with unbalanced weights and having a driving-pulley eccentrically mounted thereon, idle guidepulleys carried by said body, a driving-puley mounted independently of said body, a belt running over said driving-pulley, over said guide-pulleys and over said eccentricpulley, a suspendingrod suitably supported IIO at its u per end, extended through said tul tion that works within said throw-limiting 1o bular s aft and provided at its lower end flange, substantially as described. with ball-bearing devices directly engaging In testimony whereof I aflix my signature the IOWGIil end of said tubullar sllllraft alnd supin presence of two witnesses. 5 ortin t e same, an annu ar t owimitin dangeecured below said tubular shaft, am EMIL DRAVER' an oil-cu secured to the lower end of said Witnesses:

tubular s aft and inclosing said ball-bearing FLORENCE U. DRAVER, devices, said oil-cup having a depending por- EVERETT R. LEMON. 

